A large family (known as the Blue Fugates) lived in Troublesome Creek, Kentucky until the 1960s. Most of them lived past the age of 80, with no serious illnessjust blue skin. The trait was passed on from generation to generation. People with this condition could have blue, plum, indigo, or even purple skin.
People with this disease have the urge to eat things like dirt, paper, glue, and clay and is believed to be linked to mineral deficiency.
Another form of daring, especially of the heroic or archaic sort. See also Medieval.
And see who looks up. Sadly, I fell for this the first time. See also Pranks.